Angels V Angels that has got to suck. I mean even the movie they made based on that sucked.
You're saying The Prophecy sucked? Just want to check what you're saying there, as I think it was one of Stoltz, Walken AND Mortensen's best performances.
I've been thinking a lot about the Tippyverse aspects - Shadows with exponential proliferation, the very good point about LOS teleport (letting them move 47km/min, or 2820 km/hr) and the various rorts of conjurations and at will powers.
If we assume Pathfinder represents reality X in the same way modern roleplaying games with similar granularity represent our reality, then there'd be long term implications they don't bother to stat out as they are irrelevant for a combat.
Shadows can walk around in daylight. In theory any shadow in Golarion can cause the shadowpocalypse at noon. On the other hand they are pretty much always portrayed as avoiding bright light - especially sunlight. This might be pyschological - in which case, no rules, but likely still a limiting factor. This would make the fact most modern rooms are at a bright illumination most of the time a serious impediment.
If demons truly could teleport continuously, why would so many of them have alternate means of movement? On the other hand they are taking a momentary shortcut through the astral, and there are predators there. Might be a case of too much activity calls in the predators, and eventually you jump out but not jump in.
Similarly the 'infinfite loop' spells might not be violating Entropy - which is a sentient creature in Golarion - but instead moving things around. Drawing matter from the sun to create water, for instance. For all practical purposes this would be infinite, but when that infinity was truly put to the test (Decanter of endless water-fuelled interstellar rockets, for instance) could fail in interesting ways.